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Thank you all for your contributions. I have decided to replace them with a NEMA 7 enclosure installed with explosion proof breather/drain.

I am currently inspecting a site for an upcoming CCTV project, and I found that they were using NEMA 4X enclosures in Class 1 Div 2 and Class 1 Div 1 areas of the site for some of the existing CCTVs. These enclosures house the electrical step-down transformers for CCTVs. However, I have some...

2385 Amps is the actual Load.

Hi Gurus, For the first time, I want to design a 3ph HV utility transformer for an Apartment building with a switchboard rated for 120/208Y, 3000A, 65kA (AIC). Utility HV at proposed site is unknown. CEC 26-254 (2) stipulates that OCP is not needed on the Primary Side if secondary side has...

They aint suing my client, or nothing. I doubt it would get to that. What they are requesting is that my client has to provide a "written" guarantee that the proposed SPD at the new location would protect their equipment as well. There's no contract or agreement that my client is responsible...

Hi Gurus, Im in a bit of a dilemma here and need your opinions. A Telecom client of mine is installing his facility in a Co-location building shared by another telecom company. They are not strangers, as they share space in other locations as well. Problem is, there was a thunder storm that...

I have decided to go with option 1. Thanks

Hi Gurus, I have heard conflicting opinions on selecting a Transformer OCP device rating. Problem is while CEC 26-26(2b) stipulates conductor size on Secondary side shall have ampacity rating of not less than 125% of rated Secondary current, some in my team are applying same rule to...

I am not so sure about if BC Hydro would allow that. Was the installations on flat grounds? Due to the unbalance rocky terrain, I thought it did be best to use a Neutral self supporting (ACSR) cable for the overhead lines, and also considering that I may have to ground the neutral at first and...

Hello Gurus, Im working on my first powerline design. I want to design a private powerline extension (120/240V single ph, 30A) from an existing breaker panel in a residence to a proposed structure 150m away via overhead wooden poles in a rocky terrain. Whats the most comprehensive way to...

Thanks Guys for all the feedbacks. I initially chose a 24V battery to match the PV voltage and subsequently decided to go with 12V with as per the solar designs in my region of Alberta where it snows ALOT, but now I see understand. So, I have decided to use 3x330W LG Solar Panels, 12V battery...

Hi Keith, Its to light up a large bill board. 10Hrs is a worst case scenario (during dark winter months). It may not run for 10 Hrs, as I intend to incorporate a controller to turn-off the lights possibly after 3AM.

Hi Gurus, I plan to power Three 30W LED Lights with Solar Panel for 10 hrs at most per night. Least average sunlight hours at location is 3 hrs (in Dec). This is my first Solar project and I would like to confirm if my Solar Panel and Battery selection calculations are fine: Total Load : 3 x...

Hi Gurus, Climbing a de-energized AM tower still poses a safety Hazard, as a colleague of mine found out recently. He got zapped by a Guye wire supports of a 'de-energized' AM tower he was climbing. Probably static charges due to the effects of coupling from another AM tower in operation...

Hi Gurus, I would appreciate comments on the attached SLD and layout photos . Instead of having interlock kits install on the 200A distribution Panel, this 'MTS' seem to do the job with its own built-in interlock. From the SLD, it seemed to have power monitoring and 'load sharing Interlock"...

Good suggestion. Thanks Keith

Hello Gurus, Power Data loggers are quite expensive gadgets ($600 - $10K) to leave at a site's electrical room, in order to gather data. Wondering if there are those that come with anti-theft features, so far I couldn't find any. Thanks!

Hi Gurus, How do you determine if a building has sufficient ampacity for new installations without getting the landlord involved? I am profoundly interested in his leasehold, but the landlord has no idea if his property has sufficient power, but need me to figure out without getting him...

Hi gurus, Is there a way to connect a 100A generator via a 200A Manual Transfer Switch (MTS) to a 200A main electrical panel? The Gen is meant to power certain equipment only in the event of power failure. Are there special circuit breaker panels for this kind of purpose? Normally, I would...